// ==UserScript==
// @name         ПУК-СРЕНЬК
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       Anonymous
// @match        https://2ch.hk/*/res/*.html
// @icon         data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant        none
// ==/UserScript==

const decode = (str) => {
    return new TextDecoder().decode(
        new Uint8Array(
            str
            .replace(/(\d+[ПУК|СРЕНЬК]{3,6})/g, (m) => {
                const count = parseInt(m.replace(/[ПУК|СРЕНЬК]/g, ""), 10);
                return m.replace(count, "").repeat(count);
            })
            .replace(/ПУК/g, "0")
            .replace(/СРЕНЬК/g, "1")
            .replace(/-/g, "")
            .match(/.{1,8}/g)
            .map((c) => parseInt(c, 2))
        )
    );
};

const encode = (str) => {
    return new TextEncoder()
        .encode(str)
        .reduce((s, b) => s + b.toString(2).padStart(8, "0"), "")
        .replace(/(.)\1+/g, (m, c) => m.length + c)
        .replace(/0/g, "ПУК-")
        .replace(/1/g, "СРЕНЬК-")
        .slice(0, -1);
};

(function() {
    const posts = document.querySelectorAll('.post__message');

    posts.forEach((post) => {
        const words = post.textContent.replace(/\t+/g,"").split(/[\n, ]+/);

        words.forEach((word) => {
            post.innerHTML = post.innerHTML.replace(/(\d+)?(СРЕНЬК|ПУК)\-.+(СРЕНЬК|ПУК)/, (m) => {
                return `<div style="color:green">${decode(m).replace(/\n|<.*?>/g, "Я у мамы идиот")}</div>`;
            });
        });
    });

    let div = document.createElement('div');
    div.className = "options__box";

    let en = document.createElement('button');
    en.textContent = `Зашифровать`;
    en.addEventListener('click', (e) => {
        e.preventDefault();
        const comment = document.querySelector('[name="comment"]');
        comment.value = encode(comment.value);
    });
    div.append(en);

    let de = document.createElement('button');
    de.textContent = `Расшифровать`;
    de.addEventListener('click', (e) => {
        e.preventDefault();
        const comment = document.querySelector('[name="comment"]');
        comment.value = decode(comment.value);
    });
    div.append(de);

    const options = document.querySelector('.options');
    options.append(div);
})();